4 - Chapter2-Vehicle Performance_2_

4 - Chapter2-Vehicle Performance_2_ - Road Vehicle...

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Road Vehicle Performance: Braking TTE 4004 Lecture 4 8/29/31
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Lab Info No lab today First “lab” will be Exam 1 Monday, September 26
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Outline Quiz Review Resistance Tractive Effort Acceleration Braking
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Attendance Quiz What is the role of the transportation engineer? What are the three different types of resistance forces that act on a moving vehicle?
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Recap – Resistance Aerodynamic Rolling Grade Power to overcome resistance = force x speed 2 2 V A C R f D a ρ = (Eq. 2.3) W f R rl rl = (Eq. 2.6) WG R g 2245 (Eq. 2.9)
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Recap – Tractive Effort Maximum Tractive Effort Engine Generated Tractive Effort ( 29 L h L h f l W F rl f max / 1 / μ - - = Eq. 2.14 r M F d e e η ε 0 = Eq. 2.17
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Recap – Acceleration The force available to accelerate is given by: - = R F F net ma γ R F m = - Eq. 2.19
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Principles of Braking For roadway design and traffic analysis, vehicle braking characteristics are the most important aspect of vehicle performance. Braking performance is a key factor to the determination of: stopping-sight distance, which is one of the foundations of roadway design the length of the yellow interval for signals
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Principles of Braking Like we did for determining maximum tractive effort, we can use a force and moment-generating diagram (Fig. 2.7) to determine F bf and F br (braking force, front and rear).
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Notice that this figure is identical to Fig. 2.3, except that the braking forces have replaced the tractive forces, and are in the opposite direction because the braking forces are counteracting the forward motion. Also, ma points in opposite direction (because this force is counteracting braking force). Fig. 2.7
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4 - Chapter2-Vehicle Performance_2_ - Road Vehicle...

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